powerpc/t208xqds: fixup for t208xqds

Change QIXIS timing parameter CONFIG_SYS_CS3_FTIM2 to 8 from 0.
Fix EMI2 for t2080qds, which was caused by adding t2081qds.

Signed-off-by: Shengzhou Liu <Shengzhou.Liu@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>